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Discovery of Heteroecism (abstract) Pg. 1

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Discovery o eroecism
(Abstract)
....ia diseorery of heteroecism* that isf the requirement
in the caae of certain parasites for two very unlike hosts in
order to complete the life cycle, was discovered by de .Gary
after a long aeries of inTestigationa extending over a dozen
years or more. The theory was based on the behavior of the
stem or black rust of cereals. Farmers in the north of Europe
hod believed for many years, a century or more in fact, that the
barberry bush in the vicinity of grain fields produced rust and
in jure ci the crop. This opinion was strenuously opposed by the
sci- of the period, including de Bary, who maintained that
the rust on the barberry wms so very unlike that on wheat and rye
in structure and appearance thc.t the one could not possibly rive
•ther* They were classed under different genera.
ilererthelesst laws were passed from time to time in France, .Denmark, .::nd and Lirierioa to prohibit rry being grown near
grain fields.
fhe inTestigations of de Bary* during which he introduced
mew and highly valuable methods of research, were extensive and
thorou , and as * result hia prejudice against the theory of the
farmers was finally so far overcome that in 1883 he was ready to
announce that in some instances it L-pp* rust needed a
different and unlike host on which to complete its full development,
"'One comes around, pert ., la he cautiously says,
wto the ancient opinion according to rhich rusted wheat would
infected by'the rust of the barberry.11 The following year he
Purdue
UNIVERSITY

Discovery o eroecism
(Abstract)
....ia diseorery of heteroecism* that isf the requirement
in the caae of certain parasites for two very unlike hosts in
order to complete the life cycle, was discovered by de .Gary
after a long aeries of inTestigationa extending over a dozen
years or more. The theory was based on the behavior of the
stem or black rust of cereals. Farmers in the north of Europe
hod believed for many years, a century or more in fact, that the
barberry bush in the vicinity of grain fields produced rust and
in jure ci the crop. This opinion was strenuously opposed by the
sci- of the period, including de Bary, who maintained that
the rust on the barberry wms so very unlike that on wheat and rye
in structure and appearance thc.t the one could not possibly rive
•ther* They were classed under different genera.
ilererthelesst laws were passed from time to time in France, .Denmark, .::nd and Lirierioa to prohibit rry being grown near
grain fields.
fhe inTestigations of de Bary* during which he introduced
mew and highly valuable methods of research, were extensive and
thorou , and as * result hia prejudice against the theory of the
farmers was finally so far overcome that in 1883 he was ready to
announce that in some instances it L-pp* rust needed a
different and unlike host on which to complete its full development,
"'One comes around, pert ., la he cautiously says,
wto the ancient opinion according to rhich rusted wheat would
infected by'the rust of the barberry.11 The following year he
Purdue
UNIVERSITY